Chain saw



Jan. '10, 1928.

s. J. EENS calmi su Original Filed Nov. 9. 1922 Erm@ 4M. n W

Samuel l Bem, W M5 .Qn-ddi@ aucune Patented Jan. 10, 1928.

UNI-TED sTATEsP-ATENT ortica,

SAMUEL JJBEZNS, or NEW YORK, N. Y., AssGNon'ro'cHaIN SAW coRPoRTIoN,"AcoR-PoRA'rroN or nnnawann caan; SAW.

Refle for abandoned application'Serial'vNb. 599,833, 'tiled November9,1922. This application filed u :1' November1G,'1926.--Seria11101148365;I

My present invention relates to 'improvev'rinents in chain saws and moreparticularly to the pivots or joints between the tooth carrying links.i'

The vinvention -aimsf` to 'provide a snnple, strong, and .durablelconstruction and one -1n which the manufacturing: costs lare reduced toa minimum.-

With these andv other objects in -viewuas will hereinafter appear, theinvention mcludesthe 'novel'featii'res of construction and arrangementand combination of parts hereinafter described, the precise nature andscope of my invention beingl defined by the appended claims.

An embodiment of my invention 1S illustrated in the accompanying drawingin which Figure 1 is a Side elevation of a portion of an endless chainsaw, showing two links connected by my improved joint. i Fig. 2 is asection on line 2-2 of Fig: 1.

Fig. 3 is a detail view of the bearing ring members.

Fig. 4 is a detail view of the rivet before application to the saw, and

Fig. 5 is a view of a. modificatlon.

Referring by reference characters to this drawing, the numerals 1 1designate the overlapping links of an endless chain saw, which links maybe provided with the usual or any desired type of cutting and clearingteeth` though I prefer to use the arrangenlcnt .shown in which each linkcarries a pair of cuttin"r teeth l at. or near one end and aclearcritooth i" adjacent the other end.

The overlapping portions of these links ari` provided with aligningropenings ic and in the preferred embodiment of my invention theseopenings are provided with annular rebates l, these rebates being soarranged or located that when two .links are placed or assembled inoverlapping position the rebates are `on or in the outer faces of thelinks. Each rebate preferably occupies one-half the thickness of itslink. as shown, and is ot right-angular formation.

The numerals 2 2 designate a pair of complementary bearing rings whichhave cylindric parts 2c designed to tit the openings in the chain links,and annular flanges 2d adapted to tit the rebates l".

These bearings rings are so formed, and of such size that when assembledfrom op- Lpos'itesides-with' their cylindrie parts in the openings,aclulies whollywithin the plane offits corresponding link member with.its

.opposite faces flush with the corresponding 'faces offtlieelinkfand theinner or reduced eds Aabut'agains't cach other in the plane. of @Contactof the? overlapping links.

v-rriThecenter openings in the rings are counterisunkzor.beveled-adjacent their outer faces,

-as indicated at 2. hrough the open center .oflthc abutting-rings isinserted the rivet,

indicated at 3 in Fig. 4, which has a dared head 3 designed to lit oneof the countersinks 2, the other end beingr shaped to enter the openccntcr of the rings and heilig adapted to be thereafter upset to tillthe other countcrsink and thereby hold the two rings together andlikewise, duc to the shape of the rings and the manner in which theyengage the links, to hold the links pivotally together.

By this arrangement; I am enabled to form the rings of tempered steel toeoact with the tempered Steel links, and to -employ a. relatively softmetal for the rivets` which is capable of being upset, as the rivetlocks the two rings firmly together and makes them in eti'ect, when inuse, a single ring. all wear in the pivotal action of thc links is bornewholly by the wear rings` As the rings can be of relatively largedianleter, the central openings are relativi-iv large which enables meto use a. rivet of snlticiently .large diaineter to .secure amplil.strength to connect'. the two rings tirnil); together.

The shape of the rings is surli that tlu\ l can he readily manufacturedin quantity hy automatic machinery, and thc rivets are lilac.- wisecapable of being easily and cheaply produced.

Heretofore it has been customary. so far as I am aware` to use a. rivetwhich also serves as a pivotnlemllcr, and to five it the necessaryhardness to resist. wear.V attempts have been made to produce a rivet.having atempered body and softer head or end capable of being upset,butl in chain saw construction, due to the thinness ot the links. therivet must be so short that this is not possible.

Instead of forming the rebates. in the links, of right-angular shape. ashercinbcfore described. they may he of beveled formation, as indicatedat' 1x and the corre.-

sponding surfacesrof the rings'wmay be beveled as intliated at 2X, butI- prefer'the angular' formation just described as capable of bein moreeasily and accurately manufacture( r Having thus described lnyinvention,what I claim is I l l. In a chain saw, a pair of overlapping links.having 'aligning ropenings, the 'outer edges of the openings forinedbythe #assem-l bled links being countersunk, a pair of reversely placedtempered wvearfringseac'h of the thickness of alink fittingfthe openingsin the overlapping links, and a relatively sott metal rivet passingvthrough the rings and holding'them rigidly together.

2. In Aa chain saw, a pair of overlapping links having aligningopenings, the outer edges of the openings formed by the assem- -bledlinks' being provided with counter-sinks of right-angular vforniation,'a pair of reversely placed tempered wear rings each of -the-thicknessof a link .and lmving a eylin- "dridalportionffittlng the vopenings 1nthe overlapping links and having annular tianges fitting saidcounter-sinks, and a rivet passinv through "the open center ot' therings and holding them rigidly together.

Si In a chain saw, a pair ot overlapping links having aligning openings,the outer cedges'ofthepenings formed-by the assembledfjlinks beingcountersunk. a pair ot.' reversely pl eed tempered wenr rings ot thethickness of a Ilink fitting the openings in the overlapping -links, theopen centers of 'said rings fhaving 4counter-sunk outer edges contactingwith the entire periphery of 'the 'opening in a link, and a sott metalnii-et fpassing through said-open centers and hav- .ing headedends'fillin'g said counter-sinks and locking said wear rings rigidlytogether. .In testimonywvhereof, I affix my signature.

SAMUEL J. BENs.

